Yb 3+ Er 3+ ions 동시도핑에 의한 TiO2 분말의 열적 안정성 증가효과와 upconversion 특성 연구
Thermal stabilizing effect of Yb 3+ Er 3+ codoping into TiO2 powder prepared by sol-gel method and its upconversion characteristic
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초록
Sol-gel method로 합성한 anatase상의 TiO2와 Yb와 Er을 codoping한 TiO2: Yb 3+, Er 3+파우더의 열적안정성과 이에 따른 광촉매 특성의 변화를 비교하였다. XRD 분석을 통하여 TiO2 결정성 및 상변화에 Yb 3+, Er 3+ions이 미치는 영향을온도에 따라 비교하였으며 anatase TiO2와 rutile TiO2의 광학적 성질을 UV-Vis을 통하여 비교하였다. UV-Vis 분석결과anatase TiO2: Yb 3+, Er 3+ions도핑에 의하여 TiO2의 밴드갭이 미세하게 감소함을 확인하였고 이를 통해 광촉매 작용을 향상시킬 수 있음을 확인하였다. Yb 3+이온과 Er 3+이온이 도핑된 TiO2: Yb 3+, Er 3+파우더를 980 nm에서 PL 분석하여 녹색 및적색 형광을 하는 up-converting 형광특성을 분석하였다.
Abstract
Thermal stabilizing effect of Yb 3+, Er 3+codoping into TiO2 powder prepared by sol-gel method and its upconversion characteristics were analyzed. The effect of TiO2 : Yb 3+, Er 3+ions on crystallinity and phase transition was studied by X-ray diffraction (XRD). The change of band-gap energy induced from Yb and Er codoping was analyzed by UV-Vis. The band-gap energy of TiO2 have been slightly narrowed by Yb 3+, Er 3+codoping, which indicated that the Yb 3+,Er 3+ions can enhance the photo-catalytic property of TiO2. green and red up-conversions of Yb 3+and Er 3+co-doped Y2O3 :Yb 3+, Er 3+phosphor were analyzed by PL equipped with 980 nm laser.
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